I'm using an ST Microelectronics LIS3DSH accelerometer to detect tilt over an extended period of time. I have the accelerometer securely mounted to a stationary object away from any vibration. Over the course of two and a half days, I've found the readings slowly change in value. I've made sure it's not a defective accelerometer by performing this experiment multiple times using different accelerometers but the same exact manufacturer and part number.
Below are graphs of the type of drift I see over time. You'll notice a change of about 0.006G on X, 0.009G on Y and .05G on Z. Note in the final graph below, the magnitude continually drops over time. I have no idea why this is. It should always be 1 or very close to 1.
- Is this a common or known phenomenon with accelerometers?
- Could anyone recommend an accelerometer similar to the LIS3DSH where this undesirable behavior would not occur?
Thanks in advance for any information anyone might be able to provide.